对微信支付开发者文档中给出的API进行了封装。
提供了对应的方法：
| 方法名 | 说明 |
|---|---|
| MicroPay | 刷卡支付 |
| UnifiedOrder | 统一下单 |
| OrderQuery | 查询订单 |
| Reverse | 撤销订单 |
| CloseOrder | 关闭订单 |
| Refund | 申请退款 |
| RefundQuery | 查询退款 |
| DownloadBill | 下载对账单 |
| ShortUrl | 转换短链接 |
| AuthCodeToOpenid | 授权码查询openid |
配置 WechatPay
import github.com/perlyna/wxpay
tlsClient, _ := wxpay.NewCertClient(pk, pem, nil)
wechatPay := wxpay.New(appID, mchID, apiSecret,
wxpay.WithNotifyURL(notifyURL),
wxpay.WithTLSClient(tlsClient))统一下单：
order := make(map[string]string)
order["body"] = "腾讯充值中心-QQ会员充值"
order["out_trade_no"] = "2016090910595900000012"
order["device_info"] = ""
order["fee_type"] = "CNY"
order["total_fee"] = "1"
order["spbill_create_ip"] = "123.12.12.123"
order["notify_url"] = `http://www.example.com/wxpay/notify`
order["trade_type"] = `NATIVE`
order["product_id"] = `12`
ret, err := wechatPay.UnifiedOrder(order)订单查询：
order := make(map[string]string)
order["out_trade_no"] = "2016090910595900000012"
ret, err := wechatPay.OrderQuery(order)